Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f238aa734f02391…

MALICIOUS

PDF

78.9 KB Created: 2021-09-01 09:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a61407adab178accab88eda3846a11a0 SHA-1: f451420856940b647e93d06bdbbb1588b87ecca8 SHA-256: 5f238aa734f02391f4673e4ef8c26dc7f3d8d473bd88a40d0d3145220018c1dd
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as a malicious PDF by ClamAV, and static analysis reveals it functions as a link farm. It contains numerous URLs pointing to compromised websites, which in turn host further PDF files. This suggests a multi-stage attack designed to lead users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3497

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f626552b66---talosumuvibo.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607690c427e5e---78617386745.pdf
    • https://bruceleevideos.org/images/file/1991559090.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160805fb0dde48---16509589136.pdf
    • http://skncn.com/u/files/91346312014.pdf
    • https://khotelmarket.com/FileData/ckfinder/files/20210810_80E3E4D575182D87.pdf
    • https://propactionvehiclesuk.tv/userfiles/files/27795676799.pdf
    • http://architetturaurbanistica.it/userfiles/files/38126622895.pdf
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/33716072749.pdf
    • https://habibitours.net/ckfinder/userfiles/files/xadopekowugakivozema.pdf
    • https://ghnservizi.com/file/11811073631.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/d5a618f510ece0582e7d82c960f4c2d0/xiwaxajowif.pdf
    • http://andrewsexes.org/clients/867461/File/kurotovizaxu.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ec8adcc75---gapituw.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160846f93b238f---gubujevokajekewobubebifod.pdf
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ce9e30a96---75503760784.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/4b093241c95e759ce90a31ecf83abce3/47055486296.pdf
    • http://sgyscom.com/upload_fck/file/2021-7-17/20210717154135510831.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/tdvomfqui0v1lauk66kfq9t3nq/jimep.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/0fba431a1d0229755faa260115162412/98720706293.pdf
    • http://phantasos.org/userfiles/file/bogesuremupunamewowa.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/b6ce4ac1ac47165d8c37586c8602d0bb/24743774756.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=appraisal+system+in+hrm
    • https://www.posluh.hr/ckfinder/userfiles/files/7253851531.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4d2.bin
c88da2430387aa165d5d2f2f7f4d4ca67cd8393613c2e7308d167557a25f3e28		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D2 19024 bytes
font_01_sfnt_off000115da.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115DA 16792 bytes

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